张显,国凤林.氢扩散与裂纹尖端应力场耦合效应的有限元分析[J].表面技术,2018,47(6):240-245.
ZHANG Xian,GUO Feng-lin.Finite Element Analysis of Coupling Effect between Hydrogen Diffusion and Stress Field at Crack Tip[J].Surface Technology,2018,47(6):240-245 |
| 氢扩散与裂纹尖端应力场耦合效应的有限元分析 |
| Finite Element Analysis of Coupling Effect between Hydrogen Diffusion and Stress Field at Crack Tip |
| 投稿时间：2017-12-04 修订日期：2018-06-20 |
| DOI：10.16490/j.cnki.issn.1001-3660.2018.06.034 |
| 中文关键词: 氢扩散 应力诱导扩散 完全耦合分析 氢鼓包 裂纹扩展 |
| 英文关键词:hydrogen diffusion stress-induced diffusion fully coupled analysis hydrogen blistering crack propagation |
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| 中文摘要: |
| 目的 研究氢鼓包形成过程中应力诱导下氢原子的扩散聚集行为，并考虑氢原子扩散聚集后对裂纹尖端区域应力场的影响，探究裂纹尖端区域氢浓度、氢气压强、应力强度因子随时间的演化历程。方法 采用有限元软件ABAQUS，通过一个完全耦合分析，探究氢扩散与裂纹尖端区域应力场相互影响的动态过程。借助于断裂力学中的裂纹扩展判据判定氢鼓包是否会继续向前扩展。结果 在应力诱导作用下，氢原子源源不断地向裂纹尖端高应力区域聚集，裂纹尖端区域的氢浓度、氢压、应力强度因子随时间呈指数型增长。结论 在浓度梯度作用下，氢原子会向材料内部扩散。氢压引起的应力场会促进氢原子的扩散聚集行为，且应力场越大，促进作用越明显，使得缺陷处的氢浓度不断增大，氢压也就越来越大。当应力强度因子达到裂纹起裂的临界值时，就会导致开裂，形成氢鼓包，如此循环往复，直至氢鼓包开裂。 |
| 英文摘要: |
| The work aims to study the diffusion and aggregation behavior of hydrogen induced by stress during the process of hydrogen blistering formation, with the effect of hydrogen diffusion on the stress field in the crack tip region taken into account. We investigate the evolution of hydrogen concentration, hydrogen pressure and stress intensity factor at the crack tip with time. By using software ABAQUS, the dynamic process of hydrogen diffusion and build-up of stress field at the crack tip, as well as the interaction between hydrogen diffusion and stress concentration are investigated through a fully coupling analysis. Initiation of extension of hydrogen blistering will be determined by crack propagation criterion in fracture mechanics. Under stress induction, hydrogen diffuses towards the vicinity of the crack tip continuously, and hydrogen concentration, hydrogen pressure and stress intensity factor in the regions near crack tip increase exponentially with time. Under the action of concentration gradient, hydrogen diffuses into the interior of material. The stress field induced by hydrogen pressure will promote the diffusion behavior of hydrogen, and the larger the stress field, the more obvious the promoting effect. This makes the hydrogen concentration in the defect increases, and the hydrogen pressure increases as well. When the stress intensity factor reaches the critical value of the crack initiation, the defect will extend and form a hydrogen blister. This process happens again and again until cracking of the hydrogen blister. |
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